/*******************************************************************************
 * Copyright (c) 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 ******************************************************************************/

package org.eclipse.core.commands;

import org.eclipse.core.commands.common.NotDefinedException;

/**
 * <p>
 * A listener to the execution of commands. This listener will be notified if
 * someone tries to execute a command and it is not enabled or not defined. The
 * listener also be notified if a command is about to execute, and when that
 * execution completes. It is not possible for the listener to prevent the
 * execution, only to respond to it in some way.
 * </p>
 * <p>
 * Clients may implement, but must not extend.
 * </p>
 * <p>
 * <strong>EXPERIMENTAL</strong>. This class or interface has been added as
 * part of a work in progress. There is a guarantee neither that this API will
 * work nor that it will remain the same. Please do not use this API without
 * consulting with the Platform/UI team.
 * </p>
 * 
 * @since 3.2
 */
public interface IExecutionListenerWithChecks extends IExecutionListener {

	/**
	 * Notifies the listener that an attempt was made to execute a command that
	 * is not defined.
	 * 
	 * @param commandId
	 *            The identifier of command that is not defined; never
	 *            <code>null</code>
	 * @param exception
	 *            The exception that occurred; never <code>null</code>.
	 */
	public void notDefined(String commandId, NotDefinedException exception);

	/**
	 * Notifies the listener that an attempt was made to execute a command that
	 * is disabled.
	 * 
	 * @param commandId
	 *            The identifier of command that is not enabled; never
	 *            <code>null</code>
	 * @param exception
	 *            The exception that occurred; never <code>null</code>.
	 */
	public void notEnabled(String commandId, NotEnabledException exception);
}